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IRAUDAMP10 REV

1.1

IRAUDAMP10

300W x 2 Channel Class D Audio Power Amplifier

Using the IRS2052M and IRF6775

Jun Honda, Yasushi Nishimura and Liwei Zheng

CAUTION:

International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDAMP10 Demo board;



Always wear safety glasses whenever operating Demo Board



Avoid personal contact with exposed metal surfaces when operating Demo Board



Turn off Demo Board when placing or removing measurement probes

Содержание IRAUDAMP10

Страница 1: ...shi Nishimura and Liwei Zheng CAUTION International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP10 Demo board Always wear safety glasses whenever operating D...

Страница 2: ...SUPPLY REJECTION RATIO PSRR 14 SHORT CIRCUIT PROTECTION RESPONSE 15 IRAUDAMP10 OVERVIEW 16 FUNCTIONAL DESCRIPTIONS 18 IRS2052M GATE DRIVER IC 18 SELF OSCILLATING FREQUENCY 19 ADJUSTMENTS OF SELF OSCIL...

Страница 3: ...2 channels 4 THD N 1 or 370W x 2 channels 4 THD N 10 Residual Noise 220 V IHF A weighted AES 17 filter Distortion 0 008 THD N 100W 4 Efficiency 90 300W 4 single channel driven Class D stage Multiple P...

Страница 4: ...ons THD N 1W THD N 20W THD N 100W THD N 200W 0 015 0 009 0 008 0 015 1kHz Single channel driven Dynamic Range 100dB A weighted AES 17 filter Single channel operation Residual Noise 22Hz 20kHzAES17 220...

Страница 5: ...H1 2 GND Floating ground of Channel 1 input 3 GND Floating ground of Channel 2 input 4 CH2 INPUT Analog input for CH2 P1 1 B 50V supply referenced to GND 2 GND Ground signal from MB 3 B 50V supply ref...

Страница 6: ...aveform at test points VS1 VS2 Adjust VR1A and VR1B to set the self oscillating frequency to 500 kHz 25 kHz when DUT in free oscillating mode Functionality Audio Tests 11 Set the signal generator to 1...

Страница 7: ...1 1 0 0 0 0 2 0 0 0 5 0 0 1 0 0 2 0 0 5 0 1 0 2 0 5 1 2 5 1 0 0 m 5 0 0 2 0 0 m 5 0 0 m 1 2 5 1 0 2 0 5 0 1 0 0 2 0 0 W B Supply 50V 4 Resistive Load Fig 2 IRAUDAMP10 THD N versus Power Stereo 4 Color...

Страница 8: ...2 Anlr THD NRatio Left 100W 0 0001 100 0 001 0 01 0 1 1 10 20 20k 50 100 200 500 1k 2k 5k 10k Hz Fig 4 THD N Ratio vs Frequency Color S weep Trace Line S tyle Thick Data A xis Com m ent 1 1 B lue S o...

Страница 9: ...0 120 100 80 60 40 20 0 d B V 10 20k 20 50 100 200 500 1k 2k 5k 10k Hz No signal Self Oscillator 500kHz Fig 6 IRAUDAMP10 Noise Floor Color Sweep Trace Line Style Thick Data Axis Comment 1 1 Blue Solid...

Страница 10: ...endent CLIP outputs Once IRS2052M detects Clipping the CLIP pin can generate pulses to trigger soft clipping circuit which can limit output s maximum power as Fig 9 soft clipping circuit is not availa...

Страница 11: ...ast rise and fall times Secure dead time provided by the IRS2052M avoiding cross conduction 0 10 20 30 40 50 60 70 80 90 100 0 50 100 150 200 250 300 350 Output power W Efficiency AMP10 50V 4ohms Fig...

Страница 12: ...een DirectFET TIM Thermal Interface Material is controlled by depth of Heat Spreader s groove Choose TIM which is recommended by IR Refer to AN 1035 for more details TIM s manufacturer thickness condu...

Страница 13: ...heet According to the stress requirement find strain range for the TIM Then calculate heat spreader groove depth as below Groove Depth DirectFET s Height TIM s Thickness strain DirectFET s height shou...

Страница 14: ...1kHz shown in Fig 13 With this high PSRR IRAUDAMP10 accepts any power supply topology when the supply voltages fit between the min and max range Color Sweep Trace Line Style Thick Data Axis Comment 2...

Страница 15: ...resume the PWM If the short circuit persists the IRS2052M repeats try and fail sequences until the short circuit is removed Short Circuit in Positive and Negative Load Current Fig 14 Positive and Neg...

Страница 16: ...drivers and MOSFETs Output LPF Integrator Referring to Fig 16 below the input operational amplifier of the IRS2052M forms a front end second order integrator with R3x C2x C3x and R2x The integrator th...

Страница 17: ...block Each channel of the IRS2052M s drives two DirectFETs high and low sides in the power stage providing the amplified PWM waveform Output LPF The amplified PWM output is reconstructed back to an a...

Страница 18: ...6665 6775M Q1B D IRF6665 6775M GND GND GND CSD GND D4 1N4148 C5A 10uF 50V C5B 10uF 50V R24A 2 2K R24B 2 2K 220uF 10V C40 220uF 10V C41 C8 10uF 16V R43 470R 1W R44 470R 1W C17B 470uF 63V C17A 470uF 63V...

Страница 19: ...e at lower frequencies the bandwidth of the amplifier suffers In relative terms interference between channels is most significant if the relative frequency difference is within the audible range Norma...

Страница 20: ...grammable dead time between 45 and 105 ns All the IRAUDAMP10 models use DT1 45ns dead time Dead time Mode R1 R2 DT SD Voltage DT1 10k Open Vcc DT2 5 6k 4 7k 0 46 x Vcc DT3 8 2k 3 3k 0 29 x Vcc DT4 Ope...

Страница 21: ...ted externally to the IRS2052M Fig 19 The external shutdown circuit will disable the output by pulling down CSD pins Fig 20 If the fault condition persists the protection circuit stays in shutdown unt...

Страница 22: ...e with reference to the VS pin which is the source of the high side DirectFET In contrast to the low side current sensing the threshold of the CSH pin to trigger OC protection is internally fixed at 1...

Страница 23: ...in down to GND If the junction temperature TJ keeps increasing and exceed on chip thermal shutdown threshold 147 C the on chip over temperature protection shuts down PWM pulls OTW up to VAA and pulls...

Страница 24: ...red in the inductor in the output LPF Usually the power supply has no way to absorb the energy coming back from the load Consequently the bus voltage is pumped up creating bus voltage fluctuations Fol...

Страница 25: ...e with light loading impedance Fig 21 Fig 21 Output Low Pass Filter and Zobel Network Gain Setting The ratio of resistors R4x R3x R27x R30x R31x in Fig 22 sets voltage gain The IRAUDAMP10 has no on bo...

Страница 26: ...v C12A 220pF VSS VAA B R22A SD R56 47k CH2 CH1 C12B 220pF Q8 MJD44H11T4G Q9 MJD45H11T4G R45 10k Z5 5 6V Z6 5 6V GND GND R62 10k For EMI C62 0 01uF 50V R12A N A R12B N A DSB R26B 10K R30A 15K R31A 10K...

Страница 27: ...rata Electronics North America 2 470uF 63V CAP 470UF 63V ELECT SMG RAD C17A C17B 565 1131 ND United Chemi Con 4 0 1uF 100V CAP CER 10UF 100V X7R 10 0805 C17C C17D C19A C19B 445 1418 1 ND TDK Corporati...

Страница 28: ...onductor 13 10K RES 10K OHM 1 10W 5 0603 SMD R17A R17B R26A R26B R45 R46 R53 R54 R62 R71A R71B R104 R105 RHM10KGCT ND Rohm Semiconductor 2 1R RES 1 0 OHM 1 8W 5 0805 SMD R19A R19B RHM1 0ARCT ND Rohm S...

Страница 29: ...r 4 SS WASHER LOCK INTERNAL 4 SS Lock washer 1 Lock washer 2 Lock washer 3 Lock washer 4 Lock washer 5 Lock washer 6 Lock washer 7 H729 ND Building Fasteners 1 PCB Print Circuit Board IRAUDAM11 Rev 3...

Страница 30: ...re Assemblies Screw Screw H343 ND Screws H343 ND Stand Off 3 1893K ND Screw Stand Off 4 1893K ND Lock washers H729 ND Lock washer Lock washer Stand Off 1 1893K ND Stand Off 2 1893K ND Lock washer Scre...

Страница 31: ...iteria as defined for class II PCB S standards Gerber Files Apertures Description All Gerber files stored in the attached CD ROM were generated from Protel Altium Designer Altium Designer 6 Each file...

Страница 32: ...www irf com Page 32 of 34 IRAUDAMP10 REV 1 1 Fig 27 IRAUDAMP10 PCB Top Overlay Top View...

Страница 33: ...www irf com Page 33 of 34 IRAUDAMP10 REV 1 1 Fig 28 IRAUDAMP10 PCB Bottom Layer Top View...

Страница 34: ...anges description Date Rev 1 0 Released March 29 2011 Rev 1 1 Correct polarity of XSL pin function in Internal Clock Oscillator Jan 25 2012 WORLD HEADQUARTERS 233 Kansas St El Segundo California 90245...

Страница 35: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information International Rectifier IRAUDAMP10...

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